MODELING AN INFINITE NUCLEONIC SYSTEM - STATIC AND DYNAMICAL PROPERTIES - STUDY OF DENSITY-FLUCTUATIONS

For one decade, several fields in physics as well microscopic as macro scopic benefit from the computational particle-models (astrophysics, e lectronics, fluids mechanics...). In particular, the nuclear matter of fers an interesting challenge as many body problem, owing to the quant al nature of its components and the complexity of the in-medium intera ction. Using a model derived from semi-classical Vlasov equation and t he projection of the Wigner function on a Gaussian coherent states bas is (pseudo-particles), static and dynamical properties of nuclear matt er are studied, featuring the growing of bulk instabilities in dilute matter. Using different zero and finite range effective interactions, the effect of the model parameters upon the relation total energy - de nsity - temperature and surface energy of the pseudo-particles fluid i s pointed out. The dynamical feature is first based upon a model of th e 2-body Uehling-Ulhenbeck collisionnal term. A study of the relaxatio n of a nucleonic system is performed. At last, the pseudo-particle mod el is used in order to extract time scale for the growing of density f luctuations. This process is supposed to be a possible way to clusteri zation during heavy nuclei collisions.